Sierra Shields Nautiflex Silicone Exhaust Hose 1-1/4"Sierra Shields Nautiflex Silicone Exhaust Hose has a blue silicone cover w/ smooth finish for easy clean up. The Nautiflex hose is flexible, easy to install and has four piles of synthetic fabric and remains stable at elevated temperatures.Specifications: O.D.: 1 5/8" or 41mm; I.D.: 1 1/4" or 32mm; Wt. "C": 41.3; The temperature ranges from -20F - +350F; Length: 3' or .9m; Applications: Primarily used for straight connections in the wet exhaust system & engine water circulation line; Meets SAEJ2006 Type R1 and ISO 13363:2004 - Type 2 - Class B standards;